import java.util.Scanner;

interface Factorial {
    int calculate(int n);
}

public class LambdaFactorial {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int n = scanner.nextInt();

        Factorial factorial = (num) -> {
            int result = 1;
            for (int i = 2; i <= num; i++) {
                result *= i;
            }
            return result;
        };

        System.out.println("Factorial of " + n + ": " + factorial.calculate(n));
    }
}